To create transitions where each block is a cube, enter values for Rows and Columns that are proportional to the clip’s aspect ratio.
For example, if you are editing an HD or UltraHD timeline with standard aspect ratio of 16:9, enter a value of 9 for Rows and a value of 16 for Columns.
For smaller cubes, try multiples of those values, for example: 18 rows and 32 columns, 27 rows and 48 columns, etc.